Numerical Research on Water Erosion Resistance Characteristics of the Substrate Material of Last Stage Blades in Steam Turbine

doi:10.7652/xjtuxb202102005

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Numerical Research on Water Erosion Resistance Characteristics of the Substrate Material of Last Stage Blades in Steam Turbine

更新时间：2025-07-09

- Numerical Research on Water Erosion Resistance Characteristics of the Substrate Material of Last Stage Blades in Steam Turbine
- Vol. 55, Issue 2, Pages: 38-46(2021)
- 作者机构：
  
  太原科技大学机械工程学院,太原,030024
- 作者简介：
- 基金信息：
- DOI：10.7652/xjtuxb202102005
  CLC： TK263.3
- Online First：10 February 2021，
  
  Published：2021
- 稿件说明：
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Numerical Research on Water Erosion Resistance Characteristics of the Substrate Material of Last Stage Blades in Steam Turbine[J]. 2021, 55(2): 38-46.
DOI：

Numerical Research on Water Erosion Resistance Characteristics of the Substrate Material of Last Stage Blades in Steam Turbine[J]. 2021, 55(2): 38-46. DOI： 10.7652/xjtuxb202102005.

摘要

基于非线性显式动力学软件ANSYS LS-DYNA

采用光滑粒子流体动力学和有限元耦合算法(FEM-SPH)建立了汽轮机典型末级叶片基材17-4PH(0Cr17Ni4Cu4Nb)的高速水柱射流撞击模型

并进行了网格无关性验证

模拟了高速射流与靶材的撞击过程

研究了射流角度、射流速度和表面粗糙度对靶材水蚀特性的影响。结果表明:相同靶材表面结构下

射流角度越大

靶材水蚀越严重; 表面粗糙度对水蚀影响较大

10 μm凹槽试样的质量损失平均为2 μm凹槽试样的1.6倍

2 μm凹槽试样的质量损失约为光滑表面试样的1.4倍; 提高靶材表面光洁度

能促进水滴压力波的自由扩展

显著降低撞击压力

从而提高材料的抗水蚀性能; 射流速度越大

材料水蚀质量损失越多

靶材的水蚀累积质量损失与射流速度成指数关系

拟合得到速度指数约为3.83。

Abstract

The high-speed water jet impact model of 17-4PH(0Cr17Ni4Cu4Nb)is established by using the smoothed particle hydrodynamics(SPH)and finite element method(FEM)coupling algorithm(SPH-FEM)based on the nonlinear explicit software ANSYS LS-DYNA. The grid independence is verified and the impact process between high-speed jet and target is simulated. The influences of jet angle

jet velocity and surface roughness on the water erosion characteristics of the target material are systematically studied. The results show that under the same target surface structure

the greater the initial jet angle of the target surface is

the more serious the water erosion damage of material becomes. Surface roughness has a great influence on water erosion. The average mass loss of the 10 μm groove samples is 1.6 times that of the 2 μm groove samples. And the average mass loss of the 2 μm groove sample is approximately 1.4 times that of a smooth surface sample. The improvement of the surface smoothness can promote the free expansion of the pressure wave of the water droplets and significantly reduce the impact pressure

thereby improve water erosion resistance of the material. The mass loss of the material increases with the increase of jet velocity. There is an exponential relationship between the cumulative water erosion mass loss of the target material and the jet velocity. Fitting results show that the velocity exponent of water erosion is about 3.83.

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references

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